高雷诺数时串列双圆柱脉动压力的实验研究  

Pressure Fluctuations on the Surface of Two Circular Cylinders in Tandem Arrangements at High Reynolds Numbers

作　　者：顾志福[1] 孙天风[1] 贺德馨[2] 张亮亮[2] 

机构地区：[1]北京大学,北京100871 [2]中国空气动力研究与发展中心,四川绵阳621000

出　　处：《空气动力学学报》1992年第2期176-189,共14页Acta Aerodynamica Sinica

基　　金：国家自然科学基金

摘　　要：本文通过风洞实验给出了二维串列双圆柱在高雷诺数时(分别为Re=3.25×10~5和Re=6.5×10~5)的脉动压力分布。实验在低湍流度的均匀流中进行,模型表面光滑。实验结果表明:在这二种分别属于高亚临界和低超临界雷诺数下,串列双圆柱不同间距比时的脉动压力分布差别很大。Re=3.25×10~5时前后圆柱间的相互干扰对圆柱表面脉动压力分布的影响要比Re=6.5×10~5时大得多,而且二者干扰的规律和特性也截然不同。This paper presents the fluctuating pressure distributions on single and two circular cylinders of the same diameter in tandem arrangements at high Reynolds numbers (Re=3.25×105 and Re=6.5×105 respectively). As analytic aid of flow characteristic, some typical power spectrum of pressure on the surface of cylinder are also given. The experiments were carried out with smooth surfaces of the models in smooth low turbulent flow.The results show that at these high subcritical and low supercritical Reynolds numbers the pressure distributions on the single circular cylinder have different features with those at lower subcritical and higher supercritical ones. When Re = 3.25×105 the peak value of power spectrum of pressure on the surface of cylinder was found which means that there is regular vortex shedding from the surface of cylinder, but no any peak value can be found in those when Re=6.5×105, which means that no regular shear layer separated from the surface of cylinder at this low supercritical Reynolds number.Based on these features of single cylinder, when Re=3.25x105 at spacing of 2.2 diameters in tandem arrangement, some critical gap ratio still existed near the value of N/d= 4 as those occurred in typical subcritical one. At this time rms pressure on the surface of downstream cylinder will be much higher than that of single one. The shear layer separated from upstream cylinder will be restrained due to existence of downstream cylinder and the frequency of shear layer separated from the surface of upstream cylinder also be reduced a little bit. However, the peak value of power spectrum of pressure of downstream cylinders at θ = 90° will appear when spacing increases to 3.5 or 4.0 diameters.When Re=6.5×105, rms fluctuating pressure distributions along the surface of downstream cylinders are much difference between spacing of 2.2 and 3.5 diameters. It may suggest that these are two different kinds of flow pattern around two cylinders. When spacing increase to 3.5 or 4.0 diameters, the peak value of power s

关 键 词：雷诺数 串列双圆柱 脉动压力 

分 类 号：TU312.1[建筑科学—结构工程]